﻿<p><em>IfcMaterialClassificationRelationship</em> is a relationship assigning classifications to materials.</p>

<blockquote class="history">
HISTORY  New entity in IFC2x.
</blockquote>

<blockquote class="change-ifc2x4">
IFC4 CHANGE  The entity <em>IfcMaterialClassificationRelationship</em> is deprecated since IFC4 and shall no longer be used. Use <em>IfcExternalReferenceRelationship</em> instead.
</blockquote>
